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Commit 7b3eb798 authored by Rama Aparna Mallavarapu's avatar Rama Aparna Mallavarapu
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coresight-tmc: Avoid reading TMC buffer before enabling 



Add sticky enable flag to avoid reading TMC buffer before
enabling TMC at least once.

Change-Id: Id1c04101d65923c266242370f725ea611b0ac846
Signed-off-by: default avatarSatyajit Desai <sadesai@codeaurora.org>
Signed-off-by: default avatarRama Aparna Mallavarapu <aparnam@codeaurora.org>
parent 6ad7e09a

drivers/hwtracing/coresight/coresight-tmc.c

+4 −0
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ void tmc_flush_and_stop(struct tmc_drvdata *drvdata) 


void tmc_enable_hw(struct tmc_drvdata *drvdata)

{

	drvdata->sticky_enable = true;

	writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);

}
@@ -75,6 +76,9 @@ static int tmc_read_prepare(struct tmc_drvdata *drvdata) 
{

	int ret = 0;



	if (!drvdata->sticky_enable)

		return -EPERM;



	switch (drvdata->config_type) {

	case TMC_CONFIG_TYPE_ETB:

	case TMC_CONFIG_TYPE_ETF:

drivers/hwtracing/coresight/coresight-tmc.h

+1 −0
Original line number Diff line number Diff line
@@ -173,6 +173,7 @@ struct tmc_drvdata { 
	u32			mem_size;

	u32			trigger_cntr;

	u32			etr_caps;

	bool			sticky_enable;

};



/* Generic functions */